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Re: SMTP RFC: "MUST NOT" change or delete Received header

"John Levine" <johnl@taugh.com> Mon, 31 March 2014 01:08 UTC

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Date: Mon, 31 Mar 2014 01:07:51 -0000
Message-ID: <20140331010751.4667.qmail@joyce.lan>
From: John Levine <johnl@taugh.com>
To: ietf@ietf.org
Subject: Re: SMTP RFC: "MUST NOT" change or delete Received header
In-Reply-To: <9EC12CC9-81CD-4C3E-ADD1-283615767B17@nominum.com>
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In article <9EC12CC9-81CD-4C3E-ADD1-283615767B17@nominum.com> you write:
>On Mar 30, 2014, at 6:44 PM, John C Klensin <john-ietf@jck.com> wrote:
>> Whether one accepts it or not, "been here already" tests are not
>> about debugging.  They are about loop detection and DoS attacks.
>
>Are there MTAs that make use of the Received: header for loop detection?

Mine has since 1998.  If the SMTP daemon sees 100 Received: headers in
an incoming message, it rejects it.  This is both in qmail's SMTP
daemon and mailfront, a better SMTP daemon often used with qmail.

R's,
John

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